package com.llp.javaweb.util;


import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
/*
 * 根据请求的方法最后一段
 */

public abstract class BaseServlet extends HttpServlet {

    //根据请求的最后一段路径来进行方法的分发
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.获取请求的路径
        StringBuffer uri = req.getRequestURL();//  /brandcase/brand/selectAll
        //2.获取最后一段路径，方法名
        int index = uri.lastIndexOf("/");
        String methodName = uri.substring(index+1);//   /selectAll

        //3.执行方法
        //获取对应的BrandServlet、UserServelt字节码对象class
        Class<? extends BaseServlet> cls = this.getClass();
        //获取method对象
        try {
            Method method = cls.getMethod(methodName, HttpServletRequest.class, HttpServletResponse.class);
            //执行方法
            method.invoke(this,req,resp);
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }

    }

    protected abstract void getCode(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException;
    protected abstract void judgeCode(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException;
}
